Density reflects a characteristic of matter itself, so it will be influenced by external factors.
Generally speaking, the main physical quantities that affect the density of matter are pressure and temperature. Gas density is obviously affected by pressure and temperature. Usually, gas only gives the density under standard conditions or normal temperature and pressure, and the density under other conditions can be calculated by the state equation of gas (such as ideal gas state equation or van der Waals equation).
The density of liquid mainly depends on the composition of liquid, and it is less affected by temperature (but sometimes it can't be ignored).
The density (ρ) of the extended data object is obtained by dividing the mass (m) by the volume (v).
Under the same mass, the smaller the volume, the greater the density, and the larger the volume, the smaller the density. It is mainly used for the measurement of conversion quantity and delivery acceptance, the quality control of some oils and the simple judgment of oil performance.
The formula ρ=m/V is used in the calculation. Note: m is the mass of the object. If the gravity of an object is (g), you need to divide the gravity (g) by g( 10N/kg) to get the mass of the object, and then calculate the density.